How to Simplify Variable Expressions? (+FREE Worksheet!)
Learn the definition of variable and expression and how to simplify variable expressions.
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Step by step guide to simplifying variable expressions
- In algebra, a variable is a letter used to stand for a number. The most common letters are: \(x, y, z, a, b, c, m\) and \(n\).
- An algebraic expression is an expression contains integers, variables, and math operations such as addition, subtraction, multiplication, division, etc.
- In an expression, we can combine “like” terms. (values with the same variable and same power)
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Simplifying Variable Expressions – Example 1:
Simplify this expression. \(2x + \ 3x + \ 4=\)\(?\)
Solution:
Combine “like” terms. Then: \(2 x \ + \ 3 x \ = 5x \) (remember you cannot combine variables and numbers).
Then: \(2x + 3 x + \ 4=5x + \ 4\) (remember you cannot combine variables and numbers).
Simplifying Variable Expressions – Example 2:
Simplify this expression. \(12 \ – \ 3x^{2} \ + 5 x + \ 4 x^{2}=\)\(?\)
Solution:
Combine “like” terms: \(- \ 3x^{2} \ + 4 x^{2}=x^{2}\)
Then: \(12 \ – \ 3 x^{2} \ + \ 5x + 4 x^{2}\) \(=12 \ + x^2 + 5x\). Write in standard form (biggest powers first): \(x^2 \ + 5 x + \ 12\)
Simplifying Variable Expressions – Example 3:
Simplify this expression. \((10x+2x+3)=\)\(?\)
Solution:
Combine “like” terms: \((10x+2x)=12x\)
Then: \((10x+2x+3)=12x+3\) (remember you cannot combine variables and numbers).
Simplifying Variable Expressions – Example 4:
Simplify this expression. \(12-3x^2+9x+5x^2=\)\(?\)
Solution:
Combine “like” terms: \(-3x^2+5x^2=2x^2\)
Then: \(12-3x^2+9x+5x^2=12+2x^2+9x\). Write in standard form (biggest powers first): \(2x^2+9x+12\)
Exercises for Simplifying Variable Expressions
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Simplify each expression.
- \(\color{blue}{– 2 – x^2 – 6x^2}\)
- \(\color{blue}{ 3 + 10x^2 + 2}\)
- \(\color{blue}{ 8x^2 + 6x + 7x^2}\)
- \(\color{blue}{5x^2 – 12x^2 + 8x }\)
- \(\color{blue}{– 2(4 – 6x) – 3x }\)
- \(\color{blue}{ 9 – 2x + 5x + 2}\)
Download Simplifying Variable Expressions Worksheet
Answers
- \(\color{blue}{– 7x^2 – 2}\)
- \(\color{blue}{10x^2 + 5}\)
- \(\color{blue}{15x^2 + 6x}\)
- \(\color{blue}{– 7x^2 + 8x}\)
- \(\color{blue}{9x \ – 8 }\)
- \(\color{blue}{3x \ + 11}\)
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